Wow, a lot of great thoughts since last night everyone!

I agree that Rey’s backstory shouldn’t be important compared with what is within her now. We’re circling solutions on how to deal with the dagger on the Death Star, so maybe it’s as simple as it calling out to people who are already in tune with the Dark Side.

Rey leaves her friends to go after the dagger on Ren’s destroyer, and gets into the fight with Ren. He tells her that she doesn’t need the dagger to find the Emperor’s wayfinder, since there’s no force that can keep Rey away from the Dark Side. He suspects that Rey is even now trying to return to the dagger, though it is now useless to her and she has merely imperiled her friends to find it. When she destroys the Vader mask, his suspicions are confirmed.

I think this, along with dialogue exploring Rey’s hatred of her parents leaving and her subsequent self-deception, would be sufficient to bring the scenes in line with TLJ’s anti-revelations.

We could still have Ren tell her that her parents were killed by the Emperor’s assassin, but he says that they were killed because he had foreseen what Rey would become and wanted to leave a calling card for her to find - the dagger. However, this didn’t go entirely to plan and she ended up being drawn to a very different weapon with a dark history, which led her to Luke instead of to Palpatine.